Abstract
The paper deals with measuring change based on observed frequencies of certain critical events. On the assumption that (i) a “specifically objective” probabilistic assessment of change in event frequencies be possible which (ii) rests on the conditional likelihood function of observed events, given the total number of such events, it is shown that the event frequencies must be governed by a multiplicative “power series model” (PSM). If, in addition, unobserved events prior to the beginning of a defined observation epoch may be ignored (“ignorability assumption”), then the model must be a multiplicative Poisson model (MPM) as a special case of a PSM. Basic properties of the PSM and the MPM are investigated, an efficient method for parameter estimation and hypothesis testing in the MPM is presented, and its use is demonstrated by means of a sample application from clinical psychology. Finally, a quite different interpretation of the PSM as a rating scale model is mentioned.
The author is indebted to Immanuel Bomze, Department of Statistics, University of Vienna, and to anonymous reviewers for valuable comments on a previous draft of this paper, and to Brigitte Wild for the MPM estimation program.
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Fischer, G.H. (1991). On Power Series Models and the Specifically Objective Assessment of Change in Event Frequencies. In: Doignon, JP., Falmagne, JC. (eds) Mathematical Psychology. Recent Research in Psychology. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-9728-1_17
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DOI: https://doi.org/10.1007/978-1-4613-9728-1_17
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